| 摘要: |
| 【目的】研究抚仙湖沿湖湿地建设（计入湿地综合糙率）对湖泊水流流场的影响，为水质模拟研究提供基础。【方法】在生态水槽试验中，分别研究了3种不同高度水草在3种流量下的水力特性，得到植物水流综合糙率与植物高度的关系。以此为基础，建立了计入湿地综合糙率的抚仙湖二维水动力模型，模拟计算了抚仙湖水体（方案1）、拓展水域后水体（方案2）及在拓展水域内建设湿地后总水体（方案3）的水流流场，分析了拓展水域及建设湿地对抚仙湖流场的影响。【结果】拓展水域对抚仙湖的整体流场影响较小，然而拓展水域改变了局部边界条件，使局部区域的流速增加，如北岸区域平均流速增大52.65%，原抚仙湖水体的平均流速仅增加2.10%。湿地建设对流场的影响主要体现在湿地区域，而对抚仙湖的整体流场影响较小，如南岸湿地区域平均流速比方案2减小了68.20%，原水体的平均流速仅减小了4.11%。【结论】计入湿地综合糙率的沿湖湿地建设对抚仙湖原水体流场影响较小，可为下一步水质模拟研究提供理论基础。 |
| 关键词: 抚仙湖；湿地；综合糙率；水动力模型；流场 |
| DOI： |
| 分类号:TV131.2 |
| 基金项目:云南省教育厅科学研究基金项目（2022J0516）；云南省科技计划农业联合青年项目2017FG001(-101)；国家自然科学基金项目（51569010） |
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| Simulation study on the influence of wetland construction on the flow velocity field of Lake Fuxian considering the comprehensive roughness |
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Cheng Hao-liang1, Yang Ju-rui2
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1.Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming;2.School of Civil Engineering,Southwest Forestry University,Kunming
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| Abstract: |
| 【Objective】The influence of wetland construction considering the comprehensive roughness on flow velocity field of Lake Fuxian was studied to provide the premise for water quality simulation.【Method】In the ecological water channel, the retarding effect of three different heights plants on water flow was studied under three water flows, and the relationship between the retardation been called comprehensive roughness and plant height was obtained. On this basis, a two-dimensional hydrodynamic model considering comprehensive roughness of wetland was established to calculate and study the flow velocity fields of three different schemes. The three schemes were as follows: first was the existing waterbody, second was the expended waterbody by removing the breakwater, third was the whole waterbody after construction of the wetland. The effects of wetland plants and the expended water on flow velocity fields have been analyzed.【Result】Results show that expansion water has changed the boundary conditions of the local waters, making the magnitude of the flow velocity of the local waters prominent larger, while other areas have little impact. In the North shore, the averaged flow velocity is increased by 52.65%. In the original region, the averaged flow velocity is only increased by 2.10%. The impact of wetland on the flow field is mainly reflected in the wetland area, but has little impact on others. The averaged flow velocity in the wetland area on the South shore is decreased by 68.20% compared with the expansion water. In the original region, the averaged flow velocity is only decreased by 4.11%.【Conclusion】In summary, the construction of lakeside wetland considering comprehensive roughness has little influence on the original water flow velocity field of Lake Fuxian, which can provide theoretical basis for the water quality simulation research. |
| Key words: Lake Fuxian; wetland; comprehensive roughness; hydrodynamic model; flow velocity field |
